Calculate wallpaper

What does this calculator do?

The wallpaper calculator gives you everything you need to know before checkout: exact roll count with reserve, drops-per-roll based on real pattern-match math, paste recommendation in grams and sachet count per wallpaper type — and the single reminder that saves most projects: order all rolls from ONE dye lot.

Three differentiating features no other calculator integrates this cleanly: three-mode pattern-repeat math with per-drop calculation (instead of a flat waste percentage), wallpaper-type → paste smart-suggest with consumption formula (instead of generic “add 10 % extra”), multi-wall builder with per-wall cutouts (instead of a single perimeter input). All math runs locally in your browser — no upload, no tracking, no data leaves your device.

The calculator follows the relevant European standard DIN EN 233/234 for PVC and paper wall coverings. A general overview of wallpaper as a wall covering is on Wikipedia.

How is drop length calculated?

The real challenge of wallpaper compared to tile is the math of pattern repeat. The pattern-repeat distance dramatically shortens the usable drop count per roll, and the worst-case math depends on the match type.

Match type	Drop length formula	Typical waste
Random / Free match	height + 5 cm trim	≈ 5 %
Straight match	ceil((height + trim) / repeat) × repeat	10–15 %
Half-drop match	ceil((height + trim + repeat / 2) / repeat) × repeat	7–12 %

Worked example from real practice: a living-room wall 2.65 m high × 5.00 m wide, Euro roll 0.53 × 10.05 m, 72 cm pattern repeat in straight match, 5 cm trim top and bottom.

Drop length:    ceil((2.65 + 0.05) / 0.72) = 4 repeats × 0.72 = 2.88 m
Drops per roll: floor(10.05 / 2.88) = 3 (NOT 3.49 — round DOWN, no split drops)
Drops total:    ceil(5.00 / 0.53) = 10 drops
Rolls:          ceil(10 / 3) = 4 rolls + 1 reserve = 5 rolls

A naive calculator without pattern-repeat math would estimate this wall as 13.25 m² ÷ 5.33 m² = 2.49 → 3 rolls — wrong by 67 %. That white-space gap is exactly what this calculator fills.

Which paste for which wallpaper?

The paste question is the second most common pain point: at the home center there are four sachet types, the clerk asks “for which wallpaper?” and nobody reads the datasheet. The calculator sets the right paste automatically when you pick the wallpaper type.

Wallpaper type	Paste	Coverage	Soak time	Method
Non-woven (Vlies)	Non-woven paste 200 g	25–30 m² per sachet	0 min	Paste-the-wall
Paper	All-purpose paste 200 g	35–40 m² per sachet	5–10 min	Paste-the-paper
Vinyl	Heavy-duty / vinyl paste	25–35 m² per sachet	5 min	Paste-the-paper or wall
Textured (Anaglypta)	Special heavy paste 250–300 g	20–25 m² per sachet	8 min	Paste-the-paper
Peel-and-stick	No paste	—	—	Peel and stick
Mural (non-woven base)	Non-woven paste	same as Vlies	0 min	Paste-the-wall
Glass-fibre	Dispersion adhesive	per manufacturer	instant	Paste-the-wall
Sisal / natural	Natural-fibre paste	per manufacturer	per manufacturer	per manufacturer

Non-woven dominates the 2026 market with over 90 % share — accordingly the paste-the-wall method is the implemented default. Vinyl in bathrooms should pick a mould-resistant variant. A general overview of methylcellulose (the polymer in most wallpaper paste) is on Wikipedia.

What is a dye lot and why does it matter?

The dye lot (also batch number, run number, lot number — different terms for the same thing) is by far the most common pain point in wallpaper forums. A typical story from the DIY forum: a homeowner papers a living room with five rolls, a strip is damaged during cutting, a sixth roll is reordered three weeks later from the same store — same SKU, different lot. In daylight the reordered strip is visibly darker. On non-woven wallpaper such lot differences are especially visible as full-strip jumps or paneling stripes.

A dye lot is one production run from a single print or coating cycle. Within one lot every roll is pigment- and dimension-calibrated; between lots there are visible color and sometimes dimensional tolerances. Three consequences for ordering:

1. Order all rolls for one room from ONE lot. Even if you only intend to hang three rolls, buy four or five in one purchase and store the rest.
2. Write the lot number on each wrapper BEFORE unpacking. It’s on the banded label. Once unpacked the information is lost.
3. +1 to +2 reserve rolls is standard. The calculator automatically adds one reserve roll (two for half-drop match or repeat over 50 cm). Reserves cover late drilling, repairs, or remodel patches in two years.

The calculator surfaces this reminder as a visible card directly under the output — not a footer note, but an orange-bordered box at the front of vision. The pain point is real, the fix is trivial, and no other calculator makes it this prominent.

Which roll formats exist regionally?

Wallpaper comes in different regional roll standards. The calculator knows twelve presets across DACH, UK, AU, and the US.

Region	Format	Dimensions	m² per roll	sq ft per roll
EU / DACH	Euro roll standard	0.53 m × 10.05 m	5.33 m²	57 sq ft
EU	Wide / UK Wide	0.68 m × 10.05 m	6.83 m²	73 sq ft
EU	Non-woven XL	1.06 m × 10.05 m	10.65 m²	115 sq ft
EU	Non-woven XL Long	1.06 m × 25 m	26.5 m²	285 sq ft
EU	Woodchip 15 m	0.53 m × 15 m	7.95 m²	86 sq ft
EU	Woodchip 25 m	0.53 m × 25 m	13.25 m²	143 sq ft
EU	Glass-fibre	1.00 m × 25 m	25 m²	269 sq ft
UK	Standard	0.53 m × 10.05 m	5.33 m²	57 sq ft
AU	Standard	0.52 m × 10 m	5.2 m²	56 sq ft
AU	Wide	0.72 m × 10 m	7.2 m²	78 sq ft
US	Single roll	0.52 m × 5.03 m	2.62 m²	28 sq ft
US	Double roll	0.52 m × 10.05 m	5.23 m²	56 sq ft

US quirk documented: US wallpaper is priced per single roll but predominantly sold in double-roll packs (= 2 single rolls bonded). A common pain: the installer says “6 single rolls”, the buyer orders 6 packs and receives 12 rolls — half are returned. The calculator’s US mode explicitly shows “you need 6 single rolls = 3 double-roll packs (each pack contains 2 single rolls)”. No other calculator offers this translation.

What are concrete usage examples?

Example 1 — Living room ≈ 22 m² with non-woven plain wallpaper: one wall 5.00 m × 2.50 m = 12.5 m². Four walls of equal size: 50 m² wall area minus two doors (1.8 m² each) and two windows (1.8 m² each) = 42.8 m². Euro roll 0.53 × 10.05 m, random match: 42.8 / 5.33 = 8 → 9 rolls + 1 reserve = 10 rolls non-woven. Plus 2 × 200 g non-woven paste sachets (cover 50 m², 30-min mix time, paste-the-wall application).

Example 2 — Bedroom ≈ 14 m² with patterned wallpaper (64 cm straight-match repeat): one wall 4.00 m × 2.60 m = 10.4 m². Three more walls add up to 35 m² gross, minus door and window down to 31.4 m². Drop length = ceil((2.60 + 0.05) / 0.64) = 5 repeats × 0.64 = 3.20 m. Drops per Euro roll = floor(10.05 / 3.20) = 3. Total drops = 4 × ceil(wall width / 0.53) = approx. 32 drops. Rolls = ceil(32 / 3) = 11 + 2 reserve (large repeat!) = 13 rolls. Plus 2 × 200 g non-woven paste.

Example 3 — Hallway ≈ 6 m² with photo mural: one wall 4.00 m × 2.40 m = 9.6 m². Mural at 1.06 m roll width, custom print. Drops = ceil(4.00 / 1.06) = 4 (three full 1.06 m + one trimmed 0.82 m), each 2.40 m tall. Output: numbered drop list 1 to 4 (left → right). Plus 1 × 200 g non-woven paste, paste-the-wall, 0-min soak time.

Which other construction tools are related?

For supporting tasks around a wallpaper project: tile calculator for adjacent bathroom or kitchen renovation, meter to feet for US wallpaper datasheets, sq m to sq ft for US listings comparison. Specialized tools for borders, wallpaper-removal solvent, or sloped-ceiling-only will be added in Phase B once the first 4 weeks of search-console data confirm real demand.

Frequently Asked Questions

The page header includes twelve FAQ entries with schema.org/FAQPage markup, sourced from Google “people also ask” patterns for wallpaper-calculation queries. Each answer responds to its question in the first 10 words — voice-search-optimized for smart speakers and AI search assistants.